31313021211313 has 8 divisors (see below), whose sum is σ = 31879945290600. Its totient is φ = 30751181653248.

The previous prime is 31313021211287. The next prime is 31313021211331. The reversal of 31313021211313 is 31311212031313.

It can be written as a sum of positive squares in 4 ways, for example, as 10529222544 + 31302491988769 = 102612^2 + 5594863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31313021211313 - 2¹⁷ = 31313021080241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313021211013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271117878 + ... + 1271142511.

It is an arithmetic number, because the mean of its divisors is an integer number (3984993161325).

Almost surely, 2^{31313021211313} is an apocalyptic number.

It is an amenable number.

31313021211313 is a deficient number, since it is larger than the sum of its proper divisors (566924079287).

31313021211313 is a wasteful number, since it uses less digits than its factorization.

31313021211313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542260611.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31313021211313 its reverse (31311212031313), we get a palindrome (62624233242626).

The spelling of 31313021211313 in words is "thirty-one trillion, three hundred thirteen billion, twenty-one million, two hundred eleven thousand, three hundred thirteen".